Research on Insulation Defect Discharge Characteristics of Dry-Type Reactor Based on Acoustic Power Spectral Density

Based on the advanced and flexible acoustic detection of electrical equipment, the characteristics of acoustic signal of the insulation defects discharge of the real dry-type reactor are studied in this paper. The contamination defects and metal foreign body defects are set up, and the acoustic signals of the discharge are obtained, and the acoustic characteristics are analyzed based on the power spectrum. The results show that the discharge acoustic signal cycle of metal foreign body defect is 20 ms, and the main frequency bands are 6 ~ 8 kHz and 11 ~ 19 kHz; The acoustic signal of encapsulated pollution discharge is in the shape of "Hump", mainly with high frequency of 12 ~ 17 kHz; It is found that the power spectrum curve of metal foreign body defects fluctuates greatly and has a larger Var, while the power spectrum of encapsulated pollution defects is mainly composed of high-frequency components and has a larger MF value.